Hi masters,

I’m not an expert on this my friends, but I’m trying to understand which the 
expected behaviour is from Asterisk side when you deal with the following 
scenario:

Caller —> GSM Gateway with SIM card A —> Asterisk queue —> extension 1000

GSM gateway with call waiting activated on SIM A
Queue with “skip busy agent” disabled and ringall strategy.
SIP extension 1000 with call waiting activated, and member of Asterisk queue.

a) One Caller calls to SIM card A of GSM Gateway, call is forwarded to Asterisk 
queue where SIP extension 1000 answers.
b) New Caller calls the same SIM card A of GSM gateway (it has call waiting 
activated on the sim card), call is forwarded to Asterisk queue to the same 
extension 1000 and a pop-up appears with the second call.
c) extension 1000 accepts it so put on hold first call, then try to pickup the 
new one.

The thing is that the SIP re-invite with sendonly attribute can be seen from 
extension 1000 to Asterisk queue, but this SIP invite is not being forwarded to 
GSM gateway. So the GSM gateway keeps waiting for it and because it never 
appears the 1st call is dropped.

Maybe you have had this issue in the past. I know that Im not an expert, but I 
have been researching a lot and trying to vary configurations without clues.

The question is: Is it expected for the Asterisk queue to redirect this on-hold 
message (SIP re-invite with sendonly media attribute) to the GSM gateway so it 
can manage it call waiting feature on the same SIM card?

If we repeat the same scenario without queue intervention (i.e. call goes 
directly to the extension) the SIP re-invite floods normally between Asterisk 
and GSM gateway, so GSM gateway can decide what to do with the call.

I have no specific queue configuration, seems that queues.conf does not have 
any parameter to allow  this behaviour of re-sending re-invite/on-hold messages.

Vendor from GSM gateway side is pointing that “Asterisk js not resending 
on-hold message”.

Thanks and sorry if my ignorance on this,
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